Because two negative numbers when multiplied together make a positive number. Second, two positive numbers multiplied together make a positive number.
Here is an example:
What is the square root of 64?
8 X 8 = 64
-8 X -8 = 64
So the two square roots of 64 are 8 and -8.
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Every positive number has two square roots. Their absolute values are the same. One is positive and the other is negative.
All positive numbers have two. 0 has only one. Negative numbers have two imaginary roots but no real ones.
Any positive number has two square roots, a positive square root and its negative equivalent. This is because two negatives multiplied together equal a positive. In this instance, sqrt(625) = ±25 (that is, 25 and -25).
Every number has two square roots ... a positive one and a negative one. Example: +2 and -2 are both square roots of 4, because when you multiply either of them by itself, the answer is 4. The positive square root of a number is the square root that's not negative. The non-negative square root of a number is the positive one.